CN108548909B - Device and method capable of simulating matrix-hypertonic strip to carry out displacement experiment - Google Patents
Device and method capable of simulating matrix-hypertonic strip to carry out displacement experiment Download PDFInfo
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Abstract
A device and a method capable of simulating a matrix-hypertonic strip to carry out a displacement experiment. The method can be used for simulating a matrix-hypertonic strip which is fully saturated with oil to perform a displacement experiment, so that reliable experimental data can be obtained. The method comprises the following steps: respectively pressing and preparing a matrix core part at two sides and a middle high permeability strip part; conventionally evacuating saturated water from the pressed core, and then fully saturating oil by using a first core holder; respectively placing the 3 rock core parts which are completely saturated with the oil into three cavities of a second rubber sleeve of a second rock core holder, connecting the second rock core holder with other components of the experimental device forming a displacement loop, and starting a displacement experiment; and finally, evaluating the seepage rule and the pressure change condition in the presence of the matrix-hypertonic strip by using the obtained experimental result.
Description
The technical field is as follows:
the invention belongs to the field of oil and gas field development, and particularly relates to a device and a method capable of simulating a matrix-hypertonic strip to perform a displacement experiment.
Background art:
the indoor physical simulation technology is an effective means for researching and improving the recovery ratio of crude oil. Current physical models are generally classified into columnar cores and square cores. The two models, in cooperation with corresponding core holders, can simulate the morphology of the rock matrix in the reservoir.
The actual reservoir stratum of the oil field in China forms major pore and high-permeability strip and other advantageous channels through long-term injection development, the level of the prior technical monitoring can not be monitored by 100%, even the adjustment and the blocking can not be 100%, the high-permeability strip can objectively exist, no matter in plane or in longitudinal direction, residual oil can be generally displaced under the condition of matrix-high-permeability strip, a conventional columnar one-dimensional columnar core can be prepared at present, the high-permeability strip is arranged in the middle, but the problem of saturated oil occurs in indoor experiment saturated oil, because the permeability of the middle part is high, the saturated oil flows out from the middle part in the saturated oil process, the two side parts can not be fully saturated, the subsequent experiment can not be carried out, and the evaluation experiment is interrupted.
The invention content is as follows:
in order to solve the technical problems mentioned in the background art, the invention provides a device and a method capable of simulating a matrix-hypertonic strip to carry out a displacement experiment. In the scheme provided by the invention, two sides and a middle part of a one-dimensional core are prepared in parts, the first core holder is used for carrying out saturation respectively, the core is assembled together and placed in a second core holder after saturation, and a specially designed core rubber sleeve is adopted in the displacement process to ensure that the middle part is communicated with the two side parts, so that the purposes of full saturation and effective simulation are realized.
The technical scheme of the invention is as follows: the device capable of simulating the matrix-hypertonic strip for carrying out the displacement experiment comprises a displacement pump, a pipeline, a six-way pipe, a first displacement agent piston container, a second displacement agent piston container, an upper valve, a lower valve, a pressure gauge, an inlet end, a first core holder, a second core holder, a measuring cylinder and a constant temperature box;
the main body of the first rock core holder is a hollow cylinder with the inner diameter of 31-33mm and the outer diameter of 36-38mm, and a ring pressing inlet end is arranged on the hollow cylinder and connected with a ring pressing valve;
a set of inlet and outlet sealing components are respectively arranged at the left and right opening ends in the main body of the first core holder; the entrance and exit sealing assembly is formed by connecting a sealing head, a steel pipeline and a total precession hollow bolt, wherein the sealing head and the steel pipeline penetrate through the total precession hollow bolt, and a control valve is connected to the steel pipeline; the sealing head is divided into an upper matrix core sealing head, a middle hypertonic strip core sealing head and a lower matrix core sealing head;
a first rubber sleeve made of rubber is arranged in a main body cavity of the first core holder, the first rubber sleeve is divided into three chambers which are an upper matrix core chamber, a middle hypertonic strip core chamber and a lower matrix core chamber from top to bottom, and the chambers are not communicated with one another; the upper matrix core closing head, the middle high permeability strip core closing head and the lower matrix core closing head respectively and correspondingly close the left end and the right end of the three chambers in the rubber sleeve;
two ends of the main body of the first core holder are provided with pressing covers which are used for pressing the inlet and outlet assembly and playing a role of sealing a rubber sleeve;
the main body of the second core holder is a hollow cylinder with the inner diameter of 31-33mm and the outer diameter of 36-38 mm; the main body of the second core holder is provided with a looper press-in port end; arranging pressure measuring points on the outer wall of the main body of the second rock core holder; a set of sealing components are arranged at the inlet end and the outlet end of the second core holder main body, each sealing component comprises a closing head, a steel pipeline and a total precession hollow bolt, and a control valve is connected to the steel pipeline; the closed head and the steel pipeline penetrate through the total precession hollow bolt; a gland is fixed at the outer side of the sealing assembly and positioned at two ends of the second core holder main body, and is used for realizing the function of a sealing rubber sleeve;
a second rubber sleeve is arranged in the second core holder main body, and is divided into three chambers, namely a left core chamber, a hypertonic strip core chamber and a right core chamber from left to right; the cavity walls on the left side and the right side of the high-permeability strip core cavity are uniformly provided with high-permeability strip side wall small holes with the diameter of 2-3mm, and the three cavities are communicated through the high-permeability strip side wall small holes, so that injected liquid can flow freely; the second rubber sleeve is made of rubber, and small holes with the same size are drilled in the position, corresponding to the pressure measuring point, of the outer wall of the second rubber sleeve; openings for placing the rock cores are formed in the second rubber sleeve corresponding to the chambers; placing a matrix core portion and a hypertonic strip core portion which are fully saturated with oil by the first core holder in three chambers in the second rubber sleeve respectively;
the displacement pump is connected with a six-way valve through a pipeline, the six-way valve is respectively connected with lower valves of a first displacement agent piston container and a second displacement agent piston container through pipelines, upper valves of the two piston containers are connected with the six-way valve through pipelines, the six-way valve is connected with a pressure gauge, the six-way valve is connected with a control valve at the inlet end of the second core holder through a pipeline, and a control valve at the outlet end of the second core holder is connected with a measuring cylinder through a pipeline;
the displacement pump is used for providing power for the whole displacement loop; the six-way is used for providing a plurality of ways; the first displacement agent piston container and the second displacement agent piston container are respectively used for injecting water and chemical agent; the pressure gauge is used for recording the injection pressure of the liquid; the measuring cylinder is used for receiving produced liquid and metering the volume of the produced liquid; the thermostats were used to maintain the entire experimental run at formation temperature.
The method for simulating the matrix-hypertonic strip to carry out the displacement experiment by using the device comprises the following steps:
determining the sizes of matrix core parts on two sides of a core applied in an experiment according to the actual reservoir condition to be simulated, wherein the sizes of the matrix core parts on the two sides comprise diameter and length, simultaneously determining the permeability and the thickness of a middle high permeability strip of the core applied in the experiment, and respectively pressing and preparing the matrix core parts on the two sides and the middle high permeability strip part according to the determined parameters;
step two, performing conventional saturated water evacuation on the matrix core parts at two sides and the middle high permeability zone part obtained in the step one; then, applying saturated oil of the first core holder, recording the amount of the saturated oil, and calculating the initial oil saturation of the core; when the oil is saturated, the 3 core parts are respectively arranged in three independent cavities of the first rubber sleeve, which are not communicated with each other;
step three, respectively placing the 3 rock core parts subjected to the saturated oil in the step two into a cavity of a second rubber sleeve of a second rock core holder, and then connecting the second rock core holder with other components of the experimental device forming a displacement loop to start a displacement experiment;
and step four, evaluating the seepage rule and the pressure change condition under the condition that the matrix-hypertonic strip exists by using the experimental result obtained in the step three.
The invention has the following beneficial effects: the technical scheme provided by the invention is that two sides and a middle part of a one-dimensional core are prepared in a subsection mode, a specially-made core holder is respectively saturated, the core is assembled together into the one-dimensional core after saturation, and a self-designed core rubber sleeve is adopted in the displacement process to ensure that the middle part is communicated with the two sides, so that the purposes of fully saturating oil and effectively simulating are achieved. The invention solves the problem that the conventional matrix-high permeability strip can not fully saturate oil, so that the related experiment can not be carried out, the related matrix-high permeability strip experiment can be smoothly carried out, the seepage rule in the displacement process of the matrix-high permeability strip can be further evaluated, and the development of industrial research is facilitated.
Description of the drawings:
FIG. 1 is a schematic diagram of the composition of a displacement experimental apparatus of the present invention.
Fig. 2 is a schematic structural view of the first holder according to the present invention.
Fig. 3 is a schematic cross-sectional view of the first rubber sleeve in the first holder according to the present invention.
Fig. 4 is a schematic view of the structure of the second holder according to the present invention.
Fig. 5 is a schematic cross-sectional view of the second rubber sleeve in the second holder according to the present invention.
FIG. 6 is a schematic view of the structure of the side-wall aperture of the hypertonic strip in the second gum cover of the second holder of the present invention.
Fig. 7 is a diagram of a mold used to compact a core in the practice of the present invention.
Fig. 8 is a schematic representation of the structure of the two sided matrix core sections and the middle hypertonic strip section obtained after pressing and coring, in accordance with an embodiment of the present invention.
FIG. 9 is a graph of injected PV number versus recovery factor obtained in an embodiment of the present invention.
Figure 10 is a graph of the number of injected PVs versus in-process pressure obtained in an embodiment of the present invention.
The specific implementation mode is as follows:
the invention will be further described with reference to the accompanying drawings in which:
as shown in FIG. 1, the device capable of simulating the matrix-hypertonic strip for displacement experiment comprises a displacement pump 22, a pipeline 23, a six-way pipe 24, a first displacement agent piston container 25, a second displacement agent piston container 26, an upper valve 27, a lower valve 28, a pressure gauge 29, an inlet end 30, a first core holder, a second core holder 31, a measuring cylinder 32 and an incubator 33.
The main body of the first core holder is a hollow cylinder 9 with the inner diameter of 31-33mm and the outer diameter of 36-38mm, and a ring pressing inlet end is arranged on the hollow cylinder and connected with a ring pressing valve 18;
a set of inlet and outlet sealing components are respectively arranged at the left and right opening ends in the main body of the first core holder; the inlet and outlet sealing assembly is formed by connecting a sealing head, a steel pipeline 14 and a total precession hollow bolt 16, wherein the sealing head and the steel pipeline penetrate through the total precession hollow bolt 16, and a control valve 15 is connected to the steel pipeline 14; the sealing head is divided into an upper matrix core sealing head 11, a middle hypertonic strip core sealing head 12 and a lower matrix core sealing head 13.
A first rubber sleeve 17 made of rubber is arranged in a main body cavity of the first core holder, the first rubber sleeve is divided into three chambers which are an upper matrix core chamber, a middle high permeability strip core chamber and a lower matrix core chamber from top to bottom, and the chambers are not communicated with one another; the upper matrix core closing head 11, the middle high permeability strip core closing head 12 and the lower matrix core closing head 13 respectively and correspondingly close the left end and the right end of three chambers in the rubber sleeve.
And two ends of the main body of the first core holder are provided with glands 10, and the glands are used for pressing the inlet and outlet assembly and playing a role in sealing the rubber sleeve.
The main body of the second core holder is a hollow cylinder with the inner diameter of 31-33mm and the outer diameter of 36-38 mm; the main body of the second core holder is provided with a looper press-in port end; arranging a pressure measuring point 19 on the outer wall of the main body of the second core holder; a set of sealing components are arranged at the inlet end and the outlet end of the second core holder main body, each sealing component comprises a closing head, a steel pipeline and a total precession hollow bolt, and a control valve is connected to the steel pipeline; the closed head and the steel pipeline penetrate through the total precession hollow bolt; and the outer side of the sealing assembly is provided with a gland fixed at two ends of the second core holder main body for realizing the function of a sealing rubber sleeve.
A second rubber sleeve 20 is arranged in the second core holder main body, and is divided into three chambers, namely a left core chamber, a hypertonic strip core chamber and a right core chamber from left to right; the cavity walls on the left side and the right side of the high-permeability strip core cavity are uniformly provided with high-permeability strip side wall small holes 21 with the diameter of 2-3mm, and the three cavities are communicated through the high-permeability strip side wall small holes, so that injected liquid can flow freely; the second rubber sleeve is made of rubber, and small holes with the same size are drilled in the position, corresponding to the pressure measuring point 19, of the outer wall of the second rubber sleeve; openings for placing the rock cores are formed in the second rubber sleeve corresponding to the chambers; a matrix core portion and a hypertonic strip core portion, which are substantially saturated with oil by the first core holder, are placed in three chambers within the second rubber casing, respectively.
The displacement pump is connected with the six-way valve through a pipeline, the six-way valve is respectively connected with lower valves of a first displacement agent piston container and a second displacement agent piston container through pipelines, upper valves of the two piston containers are connected with the six-way valve through pipelines, the six-way valve is connected with a pressure gauge, the six-way valve is connected with a control valve at an inlet end of the second core holder through a pipeline, and a control valve at an outlet end of the second core holder is connected with a measuring cylinder through a pipeline.
The displacement pump is used for providing power for the whole displacement loop; the six-way is used for providing a plurality of ways; the first displacement agent piston container and the second displacement agent piston container are respectively used for injecting water and chemical agent; the pressure gauge is used for recording the injection pressure of the liquid; the measuring cylinder is used for receiving produced liquid and metering the volume of the produced liquid; the thermostats were used to maintain the entire experimental run at formation temperature.
The method for simulating the matrix-hypertonic strip to carry out the displacement experiment by utilizing the device comprises the following steps:
determining the sizes of matrix core parts on two sides of a core applied in an experiment according to the actual reservoir condition to be simulated, wherein the sizes of the matrix core parts on the two sides comprise diameter and length, simultaneously determining the permeability and the thickness of a middle high permeability strip of the core applied in the experiment, and respectively pressing and preparing the matrix core parts on the two sides and the middle high permeability strip part according to the determined parameters;
the specific implementation path of the step is as follows:
1) determining the diameter and the length of the experimental one-dimensional rock core; determining the permeability, the arc line segment and the geometric dimensions of the straight line segment of the rock cores A at the two sides and the rock core B at the middle high permeability zone;
2) and respectively manufacturing a rock core A at two sides and a high permeability strip rock core B in the middle.
(1) Preparing a pressing die;
and selecting proper long side plates and short side plates according to the sizes of the cores, and splicing and assembling the long side plates and the short side plates with the components, wherein the schematic diagram is shown in FIG. 7. The pressing die applied has long side plates 1, short side plates 2, nuts 3, fixing bars 4, pressing plates 5, and a base 6.
The long side plate and the short side plate are connected in a nested mode, are embedded in the groove of the base and are fixed through the fixing rod. When pressing is carried out, the pressing plate is placed above the material. The length of the long side plate is 350-370mm, the width is 10-15mm, and the height is 130-140 mm. The length of the short side plate is 300-305mm, the width of the short side plate is 10-15mm and is consistent with that of the long side plate, and the height of the short side plate is 130-140mm and is consistent with that of the long side plate. The length of the pressing plate is 298-300mm, the width is 298-300mm, and the height is 130-160 mm. The length of the base is 400-440mm, the width is 350-380mm, and the height is 10-15 mm.
(2) Preparing materials;
and determining the number and quality of quartz sand used by the physical model according to parameters such as porosity, permeability, particle size distribution, adhesive content and the like of the rock cores A at the two sides and the rock core B of the middle high-permeability strip.
(3) Sand twisting and die filling;
and mixing the quartz sand with the determined mesh quality with a certain amount of epoxy resin, uniformly mixing, filling into a prepared pressing mold, uniformly spreading the material in the mold, and placing a pressing plate above the material.
(4) Pressing;
and setting the pressing pressure and time, and operating the fracturing machine to pressurize the pressing die so as to shape the internal materials. And after pressing is finished, the die is disassembled.
(5) Drying the exposed core;
and (3) placing the pressed bare rock core in a thermostat for a certain time, and preparing for cutting after drying.
(6) And (5) cutting the bare rock core.
And cutting the dried bare rock core according to the length dimensions of the rock core A at two sides and the rock core B of the middle high permeability strip by using a cutting machine, and drilling by using a drill bit to obtain the A and B cylindrical rock cores meeting the dimension requirements. And cutting the cylinders A and B according to the geometric dimensions of the arc line section and the straight line section respectively to obtain matrix core parts 7(1) and 7(2) at two sides and a core part 8 of a middle hypertonic strip for experiments, as shown in figure 8.
Step two, performing conventional saturated water evacuation on the matrix core parts at two sides and the middle high permeability zone part obtained in the step one; then, applying saturated oil of a first core holder in the device capable of simulating the matrix-hypertonic strip to carry out the displacement experiment, recording the amount of the saturated oil, and calculating the initial oil saturation of the core; and when the oil is saturated, the 3 rock core parts are respectively arranged in three independent cavities of the first rubber sleeve, which are not communicated with each other.
The specific implementation path of the step is as follows:
1) saturating the three parts of the rock core with water;
(1) preparing three parts of rock cores, respectively measuring the mass of the rock cores, and calculating the volume of the rock cores;
(2) connecting a vacuum-pumping device;
(3) putting the three parts of rock into a vacuum tank, adding a proper amount of simulated formation water, sealing, and starting a vacuum pump;
(4) when the simulated formation water in the vacuum tank does not generate bubbles any more, completing saturated water, closing the vacuum pump, and taking out the core;
(5) and respectively measuring the mass of the rock core after being saturated with water, and calculating the porosity.
2) Saturating three parts of rock cores with oil after being saturated with water;
(1) placing the three parts of the saturated oil rock core in a first specially-made rock core holder C and a rubber sleeve D;
(2) connecting a saturated oil device;
(3) starting a displacement pump, setting the flow rate to start saturated oil, and stopping when water does not appear in each seepage channel;
(4) and recording the saturated oil quantity, and calculating the initial oil saturation of the core.
Step three, respectively placing the 3 rock core parts subjected to the saturated oil in the step two into a cavity of a second rubber sleeve of a second rock core holder, and then connecting the second rock core holder with other components of the experimental device forming a displacement loop to start a displacement experiment;
the specific implementation path of the step is as follows:
1) preparing a displacing agent and filling the displacing agent into a piston container;
2) connecting a displacement experimental device;
3) starting a displacement pump, setting the flow rate of the displacement pump, and injecting a displacement agent according to an experimental scheme;
4) and recording the injection and on-way pressure, the oil output and the water output of the produced liquid at regular intervals, and calculating the water content and the stage production degree.
And step four, evaluating the seepage rule and the pressure change condition under the condition that the matrix-hypertonic strip exists by using the experimental result obtained in the step three.
One specific embodiment of the present invention is given below.
In a G block of an oil field, a reservoir is mainly sandstone, has the average effective thickness of 3.6m and good physical properties, a high permeability strip is arranged in the middle of the reservoir, and the permeability is 1065 × 10-3 mu m2The average permeability on both sides of the hypertonic strip is 556 × 10-3μm2The average porosity was about 24%. The sand grains are generally ground to have the roundness mainly of argillaceous cementThe type of bond is contact bond. A calcareous strip develops in the sand layer, contains mesomorphic insect fossils inside and is mixed with a argillaceous strip, and has various oil-bearing production shapes. The saturated oil and the rich oil occupy thick oil layers; and the oil-containing and oil-immersed layers occupy the thin oil layer and the surface outer layer. The water content of the block reaches 98% after 30 years of water flooding development, and the extraction degree of the block in the water flooding stage is 35.3%. Next, a simulation of the reservoir development situation is taken as an example.
The method comprises the following steps: and determining the total size of the experimental one-dimensional core according to the actual reservoir condition to be simulated, wherein the total size comprises the diameter and the length. Determining the permeability and thickness of the high permeability strip, respectively pressing and preparing a rock core A at two sides and a rock core B in a middle high permeability strip, and respectively obtaining rock cores at two sides and a middle part through cutting, cutting and grinding;
1) determining the diameter of the experimental one-dimensional core to be 25mm, the length to be 150mm, and the permeability of the core A at two sides to be 556 × 10-3μm2The thickness is 8mm, and the permeability of the middle hypertonic strip core B is 1065 × 10-3μm2The thickness is 7 mm;
2) and respectively manufacturing a rock core A at two sides and a high permeability strip rock core B in the middle.
(1) Preparing a pressing die;
the length of the long side plate is 360mm, the width of the long side plate is 10mm, and the height of the long side plate is 135 mm. Selecting the short side plate (2) with the length of 300mm, the width of 10mm and the height of 135 mm. And (6) selecting the base with the length of 400mm, the width of 360mm and the height of 12 mm. The length of the selected pressing plate is 298mm, the width of the selected pressing plate is 298mm, and the height of the selected pressing plate is 140 mm.
The long side plate and the short side plate are connected in a nested mode, the long side plate and the short side plate are embedded in the groove of the base and are fixed through the fixing rod (4). When pressing, the pressing plate is placed above the material.
(2) Preparing materials;
core A on two sides: 263g of 50-mesh quartz sand, 3784g of 80-mesh quartz sand, 6754g of 270-mesh quartz sand and 3231g of 340-mesh quartz sand are selected.
Hypertonic strip core B: the quartz sand 243g of 50 meshes, the quartz sand 3684g of 80 meshes, the quartz sand 6864g of 270 meshes and the quartz sand 3351g of 340 meshes are selected.
(3) Sand twisting and die filling;
uniformly mixing 1457g of epoxy resin, 2g of alcohol and 101g of ethylenediamine, then respectively mixing the mixture with quartz sand of two types of rock cores, stirring and rubbing the mixture into sand, putting the sand into a pressing die after quartz sand particles are uniformly cemented, and scraping the sand by using a sieve plate. After the quartz sand particles are uniformly dispersed in the pressing die, the pressing plate is placed above the material.
(4) Pressing;
and (4) moving the die filled with the materials to the position below the fracturing machine, setting the pressure to be 5MPa, and continuously pressing for 20 minutes. And (5) removing the die after pressing is finished.
(5) Drying the exposed core;
the pressed bare core was placed in a thermostat for 48 hours and was ready for cutting after drying.
(6) Cutting an exposed core;
and cutting the dried bare rock core according to the length dimensions of the rock core A at two sides and the rock core B of the middle high permeability strip by using a cutting machine, and drilling by using a drill bit to obtain the A and B cylindrical rock cores meeting the dimension requirements. And respectively cutting the cylinders A and B according to the geometric dimensions determined in the step 1) to obtain the core model for the experiment.
Step two: preparing 2 specially-made corresponding rock core holders and corresponding rubber sleeves;
first preparation of a special core holder C and a gum cover D:
1) preparing a core holder main body C;
the core holder main part is 31mm in internal diameter, and the external diameter is 36mm, and length is 35 cm's hollow cylinder. The upper part is provided with a ring pressing inlet end.
2) Preparing a gland and a closed end;
the three sets of closed-end total screw-in hollow bolts are screwed into the holder main body through the internal threads of the gland, so that the core for experiments can be clamped.
3) And (5) preparing a rubber sleeve D.
The overall inner diameter of the rubber sleeve D is 25mm, the outer diameter is 31mm, and the length is 350 mm. The thickness of the two side walls of the inner hypertonic strip is 1 mm.
Preparing a special core holder E and a special rubber sleeve F:
1) preparing a core holder main body E;
the core holder main part is 31mm in internal diameter, and the external diameter is 36mm, and length is 35 cm's hollow cylinder. The upper part is provided with a ring pressing inlet end. And 6 pressure measuring points are sequentially arranged at the top end of the middle part for placing the three parts of rock cores.
2) Preparing a gland and a closed end;
the total screwing hollow bolt at the closed end is screwed into the holder main body through the internal thread of the gland, so that the core for experiment can be clamped.
3) And (5) preparing a rubber sleeve F.
The overall inner diameter of the rubber sleeve D is 25mm, the outer diameter is 31mm, and the length is 350 mm. The thickness of the two side walls of the inner high-permeability strip is 1mm, and small holes with the diameter of 2mm are uniformly distributed on the inner high-permeability strip. Holes with the same size are arranged at the positions corresponding to the pressure measuring points of the core holder main body on the top of the rubber sleeve.
Step three: 3, conventionally evacuating saturated water from part of the core, and adopting first special gripper saturated oil;
1) saturating the three parts of the rock core with water;
(1) preparing three parts of cores, respectively measuring the mass of the cores, wherein the mass of the core on the left side, the mass of the core on the right side and the mass of the core with a high permeability strip are 48.38g, 48.39g and 52.39g respectively, and the volume of the core with a high permeability strip is 23.58cm3、23.58cm3、25.53cm3；
(2) Connecting a vacuum-pumping device;
(3) placing the three parts of rock in a vacuum tank, adding simulated formation water until the water submerges the top surface of the rock core by 30mm, sealing, and starting a vacuum pump;
(4) when the simulated formation water in the vacuum tank does not generate bubbles any more, completing saturated water, closing the vacuum pump, and taking out the core;
(5) the mass of the rock core after being saturated with water is respectively measured, the mass of the rock core on the left side, the mass of the rock core on the right side and the mass of the rock core of a hypertonic strip are respectively 53.67g, 53.69g and 58.11g, and the calculated porosity is respectively 22.43%, 22.47% and 22.4%.
2) Saturating three parts of rock cores with oil after being saturated with water;
(1) placing the three parts of the saturated oil rock core in a first specially-made rock core holder C and a rubber sleeve D;
(2) connecting a saturated oil device;
(3) starting a displacement pump, wherein the flow rate is 0.3mL/min, starting to saturate oil, and stopping when water does not appear in each seepage channel;
(4) the saturated oil amount of the left core, the right core and the high permeability strip core is 3.98mL, 3.4mL and 4.38mL respectively, and the total initial oil saturation of the cores is 72.1%.
Step four: and (3) carrying out a displacement experiment by adopting a second special core holder, and evaluating the seepage rule and the pressure change condition of the matrix-hypertonic strip.
The experimental protocol was as follows:
TABLE 1 Experimental protocols
| Scheme(s) | Water is driven until the water content reaches 98 percent |
1) Preparing water for injection, and filling the water into a piston container;
2) connecting a displacement experimental device according to the displacement device connection diagram in the previous step;
3) the displacement pump was started and the pump speed was set to 0.3 mL/min. Injecting experimental water according to an experimental scheme;
4) recording the injection and on-way pressure, the produced fluid oil output and the water output every 20min, and calculating the water content and the stage production degree;
when the core is displaced to contain 98% of water, the production degree in the water flooding stage is 42.76%.
5) And evaluating the seepage rule and the pressure change condition under the condition that the matrix-hypertonic strip exists according to experimental data.
Fig. 9 and 10 show graphs of the results of the experiment. As can be seen from the graph of injected PV number-recovery ratio in fig. 9, in the water flooding stage, as the injected PV number increases, the recovery ratio is in an increasing state, but the increase gradually slows down. As can be seen from the graph of the number of injected PVs versus the on-way pressure in fig. 10, the on-way pressure basically shows a trend of increasing first and then decreasing as the number of injected PVs increases in the water flooding stage. The pressure measured at the inlet side was higher than the pressure at the outlet of the core end. The injection pressure of the hypertonic strip is lower than that of the cores on both sides.
Claims (2)
1. The device capable of simulating the matrix-hypertonic strip for carrying out the displacement experiment comprises a displacement pump (22), a pipeline (23), a six-way (24), a first displacement agent piston container (25), a second displacement agent piston container (26), an upper valve (27), a lower valve (28), a pressure gauge (29), an inlet end (30), a first core holder, a second core holder (31), a measuring cylinder (32) and a constant temperature box (33);
the main body of the first rock core holder is a hollow cylinder (9) with the inner diameter of 31-33mm and the outer diameter of 36-38mm, and a ring pressing inlet end is arranged on the main body and connected with a ring pressing valve (18);
a set of inlet and outlet sealing components are respectively arranged at the left and right opening ends in the main body of the first core holder; the inlet and outlet sealing assembly is formed by connecting a sealing head, a steel pipeline (14) and a total precession hollow bolt (16), the sealing head and the steel pipeline penetrate through the total precession hollow bolt (16), and a control valve (15) is connected to the steel pipeline (14); the sealing head is divided into an upper matrix core sealing head (11), a middle hypertonic strip core sealing head (12) and a lower matrix core sealing head (13);
a first rubber sleeve (17) made of rubber is arranged in a main body cavity of the first core holder, the first rubber sleeve is divided into three chambers which are an upper matrix core chamber, a middle high-permeability strip core chamber and a lower matrix core chamber from top to bottom, and the chambers are not communicated with one another; an upper matrix core closing head (11), a middle high permeability strip core closing head (12) and a lower matrix core closing head (13) respectively and correspondingly close the left end and the right end of three chambers in the rubber sleeve;
two ends of the main body of the first core holder are provided with pressing covers (10) which are used for pressing the inlet and outlet sealing assembly and playing a role of sealing a rubber sleeve;
the main body of the second core holder is a hollow cylinder with the inner diameter of 31-33mm and the outer diameter of 36-38 mm; the main body of the second core holder is provided with a looper press-in port end; arranging a pressure measuring point (19) on the outer wall of the main body of the second core holder; a set of sealing components are arranged at the inlet end and the outlet end of the second core holder main body, each sealing component comprises a closing head, a steel pipeline and a total precession hollow bolt, and a control valve is connected to the steel pipeline; the closed head and the steel pipeline penetrate through the total precession hollow bolt; a gland is fixed at the outer side of the sealing assembly and positioned at two ends of the second core holder main body, and is used for realizing the function of a sealing rubber sleeve;
a second rubber sleeve (20) is arranged in the second core holder main body, and is divided into three chambers, namely a left core chamber, a hypertonic strip core chamber and a right core chamber from left to right; the cavity walls on the left side and the right side of the high-permeability strip core cavity are uniformly provided with high-permeability strip side wall small holes (21) with the diameter of 2-3mm, and the three cavities are communicated through the high-permeability strip side wall small holes, so that injected liquid can flow freely; the second rubber sleeve is made of rubber, and small holes with the same size are drilled in the position, corresponding to the pressure measuring point (19), of the outer wall of the second rubber sleeve; openings for placing the rock cores are formed in the second rubber sleeve corresponding to the chambers; placing a matrix core portion and a hypertonic strip core portion which are fully saturated with oil by the first core holder in three chambers in the second rubber sleeve respectively;
the displacement pump is connected with a six-way valve through a pipeline, the six-way valve is respectively connected with lower valves of a first displacement agent piston container and a second displacement agent piston container through pipelines, upper valves of the two piston containers are connected with the six-way valve through pipelines, the six-way valve is connected with a pressure gauge, the six-way valve is connected with a control valve at the inlet end of the second core holder through a pipeline, and a control valve at the outlet end of the second core holder is connected with a measuring cylinder through a pipeline;
the displacement pump is used for providing power for the whole displacement loop; the six-way is used for providing a plurality of ways; the first displacement agent piston container and the second displacement agent piston container are respectively used for injecting water and chemical agent; the pressure gauge is used for recording the injection pressure of the liquid; the measuring cylinder is used for receiving produced liquid and metering the volume of the produced liquid; the thermostats were used to maintain the entire experimental run at formation temperature.
2. A method for simulating a matrix-hyperosmotic strip for a displacement experiment, comprising the steps of:
determining the sizes of matrix core parts on two sides of a core applied in an experiment according to the actual reservoir condition to be simulated, wherein the sizes of the matrix core parts on the two sides comprise diameter and length, simultaneously determining the permeability and the thickness of a middle high permeability strip of the core applied in the experiment, and respectively pressing and preparing the matrix core parts on the two sides and the middle high permeability strip part according to the determined parameters;
step two, performing conventional saturated water evacuation on the matrix core parts at two sides and the middle high permeability zone part obtained in the step one; then, using the first core holder saturated oil in the device in claim 1, recording the amount of the saturated oil, and calculating the initial oil saturation of the core; when oil is saturated, the matrix core parts at the two sides and the middle hypertonic strip part are respectively arranged in three independent cavities of the first rubber sleeve in the device in claim 1, wherein the cavities are not communicated with each other;
step three, respectively placing the 3 core parts which are subjected to the second step of saturated oil into a cavity of a second rubber sleeve of a second core holder in the device in claim 1, and then connecting the second core holder with a displacement pump (22), a pipeline (23), a six-way (24), a first displacement agent piston container (25), a second displacement agent piston container (26), an upper valve (27), a lower valve (28), a pressure gauge (29), an inlet end (30) and a measuring cylinder (32) in the device in claim 1 which form a displacement loop to start a displacement experiment;
and step four, evaluating the seepage rule and the pressure change condition under the condition that the matrix-hypertonic strip exists by using the experimental result obtained in the step three.
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Citations (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104727814A (en) * | 2015-02-14 | 2015-06-24 | 东北石油大学 | Heterogeneous artificial core |
| CN104833618A (en) * | 2015-02-14 | 2015-08-12 | 东北石油大学 | Method and device for performing simulating profile control to heterogeneous reservoir in laboratory |
| CN105606787A (en) * | 2015-12-31 | 2016-05-25 | 中国石油天然气股份有限公司 | Core capillary pressure curve testing device and method |
| CN105651963A (en) * | 2015-12-30 | 2016-06-08 | 中国石油天然气股份有限公司 | Testing device for imbibition capillary pressure curve of rock core as well as working method and controller of testing device |
| CN106324223A (en) * | 2016-09-30 | 2017-01-11 | 东北石油大学 | High-seepage stripe rock core model, and manufacturing method and device thereof |
| CN106967403A (en) * | 2017-04-24 | 2017-07-21 | 东北石油大学 | A kind of oilfield reservoir macropore or special high permeable strip sealing agent and preparation method thereof |
Family Cites Families (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US10466153B2 (en) * | 2016-02-25 | 2019-11-05 | Exxonmobil Upstream Research Company | Coreflood testing system and methods for simultaneous measurement of key core properties |
| US10444218B2 (en) * | 2016-08-09 | 2019-10-15 | Saudi Arabian Oil Company | Multiple function dual core flooding apparatus and methods |
| CN106285590B (en) * | 2016-09-30 | 2019-04-09 | 东北石油大学 | A kind of apparatus and method judging whether chemical agent fails for high infiltration strip parameter |
-
2018
- 2018-03-10 CN CN201810197102.5A patent/CN108548909B/en not_active Expired - Fee Related
Patent Citations (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104727814A (en) * | 2015-02-14 | 2015-06-24 | 东北石油大学 | Heterogeneous artificial core |
| CN104833618A (en) * | 2015-02-14 | 2015-08-12 | 东北石油大学 | Method and device for performing simulating profile control to heterogeneous reservoir in laboratory |
| CN105651963A (en) * | 2015-12-30 | 2016-06-08 | 中国石油天然气股份有限公司 | Testing device for imbibition capillary pressure curve of rock core as well as working method and controller of testing device |
| CN105606787A (en) * | 2015-12-31 | 2016-05-25 | 中国石油天然气股份有限公司 | Core capillary pressure curve testing device and method |
| CN106324223A (en) * | 2016-09-30 | 2017-01-11 | 东北石油大学 | High-seepage stripe rock core model, and manufacturing method and device thereof |
| CN106967403A (en) * | 2017-04-24 | 2017-07-21 | 东北石油大学 | A kind of oilfield reservoir macropore or special high permeable strip sealing agent and preparation method thereof |
Non-Patent Citations (2)
| Title |
|---|
| Experimental investigation of gas-water relative permeability for gas-hydrate bearing sediments from the Mount Elbert Gas Hydrate Stratigraphic Test Well,Alaska North Slope;Andrew Johnson;《Marine and Petroleum Geology》;20110228(第28期);第419-426页 * |
| 水基钻井液滤液侵入半径计算模型研究;陈向明;《中国优秀硕士学位论文全文数据库 工程科技Ⅰ辑》;20170215(第02期);第B019-47页 * |
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